Transactions with Related Parties - Cost Allocations (Details) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Related Party Transactions [Abstract] | ||
| Related party, initial amount for certain general and administrative services | $ 3.5 | $ 3.0 |